Update container-registry SDK and fix default region

[jhart1685]

Signed-off-by: James Hart [email protected]

The dependency update changes the public default region to global.
This PR also alters the private default and adds ca-tor and br-sao to the list of private regions.

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Relates OR Closes #0000

Output from acceptance testing:

$ TF_ACC=1 go test ./ibm -v -run="TestAccIBMCr.*" -timeout 700m
...
=== RUN   TestAccIBMCrNamespacesDataSourceBasic
--- PASS: TestAccIBMCrNamespacesDataSourceBasic (51.53s)
=== RUN   TestAccIBMCrNamespaceBasic
--- PASS: TestAccIBMCrNamespaceBasic (39.09s)
=== RUN   TestAccIBMCrNamespaceAllArgs
--- PASS: TestAccIBMCrNamespaceAllArgs (66.13s)
=== RUN   TestAccIBMCrRetentionPolicyAllArgs
--- PASS: TestAccIBMCrRetentionPolicyAllArgs (35.06s)
PASS
ok  	github.com/IBM-Cloud/terraform-provider-ibm/ibm	192.903s